The yield strength and ultimate strength of 4.6 grade bolts are-
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A.
240 N/mm2 and 400 N/mm2
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B.
20 N/mm2 and 28 N/mm2
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C.
200 N/mm2 and 400 N/mm2
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D.
200 N/mm2 and 280 N/mm2
Correct Answer:
A. 240 N/mm2 and 400 N/mm2
Explanation:
For a grade 4.6 bolt, the first digit (4) represents 1/100th of the nominal tensile strength, resulting in 400 N/mm2. The second digit (6) indicates that the yield strength is 60% of the tensile strength. Therefore, the yield strength is calculated as 0.6 times 400, which equals 240 N/mm2.
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